• Season 5 Episode 4
  • Brave New World

  • Airdate:10.08.2008.

Meredith freaks out when Derek discovers her mother's old diary in the house, Callie frets as she prepares for her first official date with Erica, and Cristina stumbles into a part of the hospital that neither she nor her fellow residents have seen before 

series regulars:

    Ellen Pompeo as Meredith Grey
    Patrick Dempsey as Derek Shepherd
    Sandra Oh as Cristina Yang
    Katherine Heigl as Isobel "Izzie" Stevens
    Justin Chambers as Alex Karev
    T.R. Knight as George O'Malley
    Chandra Wilson as Miranda Bailey
    James Pickens, Jr. as Richard Webber
    Sara Ramirez as Callie Torres
    Eric Dane as Mark Sloan
    Chyler Leigh as Lexie Grey
    Brooke Smith as Erica Hahn

guest cast:

    Amy Aquino as Marianne
    Larry Brandenburg as Arnie
    Bre Blair as Lauren
    John Sloan as David
    Steven W. Bailey as Joe
    Kathleen Early as Dr. Daisy Pepman
    Max Burkholder as Duncan

written by:

Debora Cahn

directed by:

Eric Stoltz